I guess you could say it's common sense that cell phones, by their nature, increase the risk of cancer at least somewhat, but the size of the risk is unclear(to me, at least). I would wager that driving your car for an hour everyday would be a lot riskier than having your phone in your pocket. My point is that there is risk involved in everything we do, but we still do these things because they increase our productivity/convenience/enjoyment/whatever. If you don't think the risk is worth it, fine, you can act accordingly. If you think other people are underestimating the risk then you can work to make them more aware of these matters(which you seem to be doing). But I'm not sure what the implication is of what you are saying. Do you want to ban cell phones or restrict their use? If so, then I cannot agree. The only acceptable solution to me is to allow individuals make their own choices, while continually raising awareness about any potential issues.
Also what about the invention of, say, the car? Would you have oppose that because only rich people could afford it in the beginning, and this would be "class warfare"?
P.S. I thought of this thread today and decided to turn my phone off in class instead of burritos it on silent in my pocket. You may just have saved my life
P.S.S. When I was 12 I was one of the only kids in my class who didn't have a cell phone, and this was several years before the iphone came out, so I'm not sure you can really attribute cell phone usage by kids to Steve Jobs.